Re: [Dev-luatex] [PATCH] Allow literal # in argument text by escaping

On Mon, May 27, 2019 at 10:15:25AM +0200, luigi scarso wrote:

On Sun, May 26, 2019 at 3:36 PM Marcel Fabian Krüger wrote:

...

Hi,

inspired by [a recent TeX.sx question][1] this allows delimited macros with `#` in the parameter text by doubling the `#`. It isn't needed that often but it is useful if you try to analyze the parameter text of a TeX macro using TeX code. Also it is completely backward-compatible (`##` always triggers an error without this) and it is very easy to implement.

For example:

\def\test#1###2{(#1)[#2]} \test hello#{world}

would result in (hello)[world]

Best regards, Marcel Krüger

hm, context mkiv already has the "named parameters" eg \def\doflushparallel#instance#status#line#label#content% called at lua end {\begingroup \def\currentparallelinstance{#instance}% \def\currentparallelnumber {#status}% \def\currentparallelline {#line}% \def\currentparallellabel {#label}% \def\currentparallelcontent {#content}% can be kep at the lua end .. no need to use a virtual file \ifcase#status\relax \expandafter\buff_parallel_flush_nop \or \expandafter\buff_parallel_flush_yes \fi \endgroup}

(see buff-par.mkvi )

Perhaps one can play with a named parameter as kind of separator.

-- luigi

That looks interesting. How is it actually implemented? I couldn't find it in the ConTeXt source. Especially it looks as if the `\def` primitive is unchanged, but I do not see how this can work then. Anyway I do not understand what you say with your last statement. How would they help solving the original problem of `#` delimiters? As far as I can tell they are rewritten into "normal" positional arguments, so I do not see how they could help. Best regards, Marcel